Documents that high-level stuff and TCP/UDP are not available on HTML5. (And that networking in general depends on platform and OS)
Also a link to the juicy stuff at the top, as well as some style fixes, especially removed lots of difficult to parse braces.
Closes https://github.com/godotengine/godot-docs/issues/508
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- Moved the paragraph regarding additional GDNative-interfaced languages to the GDNative section
- Added a paragraph about Mono to the C# section
- Changed the casing on some terms used in the VisualScript section (nouns/verbs aren't capitalized in English)